um, i drank exactly like you. i'm 22. when i got sober, most (if not all) of my friends were still partying like the little rockstars we thought we were and most of them thought i was crazy for quitting. i didn't drink every day, i binge drank on weekends and partied as much as i could. but, it's not HOW you drank, it's what happens when you drink. enough happened to convince me that i'm an alcoholic. no DUI, no car wrecks, no job loss... just enough burnt bridges with people i loved, and hurting a man i never thought i'd hurt. that's me, emily, and i'm in AA. 14 months of sobriety later, i've managed to make amends to people that i never thought i'd be able to. it's pretty amazing to see where i am now, vs. where i was when i first sobered up.
so, best of luck! and, don't shut the door totally on any options... sobriety is a fantastic voyage, that's for sure.